Java itext为pdf 文件添加水印核心功能代码片段

野性酷女 2023-10-10 13:11 62阅读 0赞

/**
    	 * 
    	 * @param content
    	 * @param pageRect
    	 * @param waterMarkContent 水印文字
    	 */
    	private static void addWaterMark(PdfContentByte content, Rectangle pageRect, String waterMarkContent){
    		try {
    			// 方式一:系统自带字体文件文件
    //			String path= "C:\\Windows\\Fonts\\SIMHEI.TTF";
    //			BaseFont bf = BaseFont.createFont(path, BaseFont.IDENTITY_H,BaseFont.EMBEDDED);
    			//BaseFont bf = BaseFont.createFont();
    	       
    	        // 方式二:指定字体文件拷贝至源码文件中src/main/java,通过读取流方式事项字体文件加载
    	        InputStream stream = Thread.currentThread().getContextClassLoader().getResourceAsStream("com/digipower/erms/font/SIMFANG.TTF");
    	        byte[] bytes = new byte[stream.available()];
    	        stream.read(bytes);
    	        BaseFont bf = BaseFont.createFont("SIMFANG.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED, BaseFont.NOT_CACHED,
    	        		bytes, bytes);
    
    	        Font f = new Font("仿宋", Font.PLAIN, SimpleTypeConverterUtil.convertIfNecessary(ApplicationPropertiesHolder.getProperty("watermark.size", "50"), int.class));
    	        FontMetrics fm = sun.font.FontDesignMetrics.getMetrics(f);  
    	        int textH = fm.getHeight();
    	        int textW =fm.stringWidth(waterMarkContent);
    			content.beginText();
                // 设置字体填充色值
    			content.setColorFill(new Color(201,189,189));
                 // 设置字体大小
                content.setFontAndSize(bf, SimpleTypeConverterUtil.convertIfNecessary(ApplicationPropertiesHolder.getProperty("watermark.size", "23"), float.class));
                 // 设置字体透明度
                PdfGState gs = new PdfGState();
                Float opacity = Float.valueOf(ApplicationPropertiesHolder.getProperty("watermark.opacity", "0.8"));
                gs.setFillOpacity(opacity);// 设置透明度为0.8
                content.setGState(gs);
                //高度，宽度的增长步长， 目前分别是 : textH*5, textW*4。 根据后续业务调整,跟字体，size相关.
                for (int height = 100 + textH; height < pageRect.getHeight();  
                        height = height + textH * 5) {
                    for (int width = 200 + textW; width < pageRect.getWidth() + textW;   
                            width = width + textW * 2) {
                        // 设置水印内容和水印倾斜角度
                    	content.showTextAligned(Element.ALIGN_LEFT, waterMarkContent, width - textW, height - textH, 30);
                    }  
                }
                content.endText();
    			
    		} catch (Exception e) {
    			logger.error("添加水印出错. waterMarkContent :" + waterMarkContent, e);
    		} 
    	}